锻压技术

轧制及T6 处理对SiCp / 6061Al 复合材料拉伸力学性能的影响

英文标题：Influence of rolling and T6 treatment on tensile mechanical properties for SiCp / 6061Al composites

作者：刘守法1 乔　勋1 周兆锋2 刘丹成3

分类号：TB331

出版年,卷(期):页码：2023,48(1):165-170

摘要：

对铸态SiCp /6061Al 复合材料分别实施了热轧及热轧+T6 处理两种后处理工艺, 采用扫描电镜、X 射线衍射仪及拉伸试验设备, 研究了热轧及T6 处理对复合材料显微组织及抗拉强度的影响。结果表明, 热轧可以有效地细化铸态SiCp /6061Al 复合材料内的增强颗粒, 并消除材料内部孔洞, 从而提高材料的抗拉强度。试样在拉伸外力作用下, 在增强颗粒与基材间的界面处首先出现裂纹, 裂纹扩展后使试样整体断开, 热轧后对试样进行T6 处理可以有效地消除轧制引起的增强颗粒与铝基材界面处的残余应力, 提高增强颗粒与基材间的浸润性, 从而提高材料的抗拉强度。在拉伸外力作用下试样中的增强颗粒首先开裂, 裂纹扩展后使试样整体断裂。SiCp /6061Al 复合材料随着轧制压缩率的增大, 材料的抗拉强度先增大后减小, 轧制压缩率为60%的热轧+T6 处理的试样在室温和200 ℃下的抗拉强度均达到最大, 分别为350 和290 MPa。

The as-cast SiCp /6061Al composites was subjected to two post-treatment processes of hot rolling and hot rolling+T6 treatment, respectively. Then, the influences of hot rolling and T6 treatment on the microstructure and tensile strength of the composites were studied by scanning electron microscope, X-ray diffractometer and tensile test equipment. The results show that hot rolling can effectively refine the reinforced particles in the as-cast SiCp /6061Al composites and eliminate the internal pores of material to improve the tensile strength of material. Under the action of external tensile force, the sample first appears cracks at the interface between reinforced particles and base material, and then the cracks expand to disconnect the sample as a whole. T6 treatment for sample after hot rolling can effectively eliminate the residual stress at the interface between reinforced particles and aluminum base material caused by rolling, improve the wettabilitybetween reinforced particles and base material, so as to improve the tensile strength of material. Under the action of external tensile force,the reinforced particles in the sample crack first, and then the whole sample breaks after the cracks expand. With the increasing of rolling compression ratio, the tensile strength of SiCp /6061Al composites increases first and then decreases, and the tensile strength of hotrolling+T6 treatment sample with a rolling compression ratio of 60% reaches the maximum at room temperature and 200 ℃, which are 350

and 290 MPa, respectively.

基金项目：

陕西省自然科学基础研究计划项目(2020JM-645)

作者简介: 刘守法(1980-), 男, 硕士, 副教授 E-mail: liushoufa807456@ 163. com

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